CVE-2002-0518
The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for…
Does this matter?
Lower severity and a low EPSS score (2.47%). Track it; it rarely justifies an emergency change on its own.
Description
The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
- EPSS
- 2.47% probability · 84th percentile
- CISA KEV
- Not listed
- Affected
- freebsd/freebsd
- Source
- cve@mitre.org
References
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
- http://www.iss.net/security_center/static/8873.php
- http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
- http://www.osvdb.org/6046
- http://www.securityfocus.com/bid/4524Patch, Vendor Advisory
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:20.syncache.asc
- http://www.iss.net/security_center/static/8873.php
- http://www.iss.net/security_center/static/8875.phpPatch, Vendor Advisory
- http://www.osvdb.org/6046
- http://www.securityfocus.com/bid/4524Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.